SRSLY, DEAN/CAS IS MY FAVORITEST OTP OF ALL OTPS EVAR. We're so spoiled by canon. ♥_____♥ (Nnnnngh angel!porn.) But when it comes to writing fic, I can't resist rare pairings either! The bigger the challenge, the better, as far as I'm concerned. (No lie, I honestly thought Kurt/Puck was a rare pairing before I started writing it!)